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Pharmacological Treatment for Pregnant Women Who Smoke Cigarettes

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Pharmacological Treatment for Pregnant Women Who Smoke Cigarettes TOBACCO INDUCED DISEASES Vol. 1, No. 3: 165-174 (2003) © PTID Society Pharmacological Treatment for Pregnant Women who Smoke Cigarettes Chan BC, Koren G The Motherisk Program, Division of Clinical Pharmacology and Toxicology, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada ABSTRACT: Smoking has been associated with several concerns in pregnancy including miscarriage, preterm delivery and stillbirth. Unfortunately, approximately 12% of the preg- nant population continue to smoke cigarettes, suggesting a need for additional therapy be- yond behavioural change. This paper reviews the literature on the use of nicotine replace- ment therapy and bupropion (Zyban®) in the pregnant human population, the pharmaco- kinetics of nicotine in the pregnant woman, and current guidelines for smoking cessation for pregnant patients. There are currently four studies that have investigated the use of nicotine patch, three for nicotine gum, and registry and preliminary reports for bupropion. These studies did not show any adverse pregnancy outcomes with the use of pharmacological aid for smoking cessation. All the nicotine replacement therapy studies, with the exception of one randomized-controlled nicotine patch trial had small sample sizes and looked at short- term use of drug in the third trimester. Two studies have examined the pharmacokinetics of nicotine in the pregnant woman. The results from these studies reveal greater nicotine me- tabolism in pregnant individuals who continue to smoke during pregnancy. Current guide- lines from several organizations uniformly recommend that Nicotine Replacement Therapy should be considered if non-pharmacological therapies have been unsuccessful. Bupropion is recommended in pregnancy if the benefits outweigh the risks. There is a need for further studies on the safety and effectiveness of Nicotine Replacement therapy and bupropion in pregnancy. However, considering the current research and guidelines, pharmacological ces- sation aids should be considered if non-pharmacological therapies have not been effective. INTRODUCTION in the survey than deaths due to second-hand smoke and smoking causing lung damage after a few years. Smoking during pregnancy is a serious terato- Despite the risk of smoking in pregnancy being well genic concern. As early as the 1960s, research revealed established in society, many pregnant women continue a relationship between smoking and birth-weight [1]. to smoke. The National Vital Statistics Report in the US Since then, numerous studies have found an association reported that 12.2 percent of all women giving birth in between smoking and an increased risk of several other 2000 reported smoking during pregnancy [3]. With 4 adverse effects in pregnancy (Table 1). From this infor- million births in the US for the same year, approxi- mation, the general population has been well informed mately 500,000 pregnancies were at risk because of that smoking during pregnancy is a risky behaviour. In maternal smoking. In the non-pregnant population, a 1999 Annenberg Tobacco Survey given to 14- to 22- smoking cessation using nicotine replacement therapy year-olds in the US, 97% of non-smokers and 93% of (NRT), in the form of gum, patch, lozenge, nasal spray smokers identified that smoking while pregnant can and inhaler have been found to be efficacious in in- harm the baby [2]. This risk was more widely identified creasing quit rates [4-19]. As a result, NRT has been an ________________________________________ Correspondence: Gideon Koren, MD, Director, The Motherisk Program, Division of Clinical Pharmacology and Toxicology, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, M5G 1X8, Canada Email: [email protected] Fax: +416-813-7562 166 Chan BC, Koren G acceptable aid for smoking cessation in the general Table 1: Reproductive concerns that are associated with population. cigarette smoke exposure The drug manufacturers, on the other hand, have contraindicated the use of NRT in the pregnant popula- Ectopic Pregnancy 40-47 tion. In a survey of six Boston, Massachusetts, obstetric Premature Rupture of Membrane 46;48-53 clinics from 1996-1997, 42% of the obstetric providers did not discuss nicotine replacement therapy with any Abruptio Placentae 46;54-63 of their patients who continued to smoke cigarettes [20]. Spontaneous Abortion 64-68 Given a hypothetical scenario about a 20-cigarettes-per- day smoking pregnant woman motivated to quit using Placenta Previa 55;69-78 nicotine replacement therapy, 44% of the obstetric pro- Low birthweight (<2500g)/ Small for Gestational viders considered it usual practice to prescribe or rec- Age 79-105 ommend NRT [20]. However, if the safety of nicotine replacement therapy use in pregnancy was supported by Preterm Delivery (<37 weeks) 106-111 “definitive evidence,” the number of practitioners rec- Stillbirth 112-115 ommending or prescribing this therapy increased to 92%. This stresses the importance of understanding the Neonatal mortality 116;117 safety and effectiveness of NRT use in pregnancy. Cur- Perinatal mortality 105 rently several studies have looked at the use of nicotine patch and nicotine gum in pregnant individuals. SIDS 118;119 Cognitive deficit 120-122 NICOTINE REPLACEMENT THERAPIES AND PREGNANCY ing nicotine patch and pregnancy (n=250) was pub- Nicotine Patch lished by Wisborg et al [24]. Healthy pregnant women Currently four studies have been conducted on less than 22 weeks pregnant, smoking more than 10 the use of nicotine patch in pregnant women. A pro- cigarettes per day were given prenatal smoking cessa- spective study by Wright et al (n=6) [21], monitored the tion counseling by a midwife four times during the mother and fetus during and after a six-hour application pregnancy and assigned either nicotine patch or pla- of 21-mg transdermal nicotine patch, following a day of cebo. Treatment duration was 11 weeks for both groups. smoking abstinence. Another prospective controlled In the active group, participants were given 15-mg study by Ogburn et al (n=21) [22], assessed maternal patches (16 hours/day) for eight weeks followed by 10- and fetal effects during a four-day application of 22-mg mg patches (16 hours/day) for three weeks. In this Dan- transdermal patch. Baseline measurements in normal ish study, the mean birth weight of the newborns was smoking conditions were conducted within a week of 186g (95% CI) heavier than the control group. The in- patch application. Both studies did not find significant vestigators also found no significance in the rate of low changes in fetal heart rate and umbilical artery Doppler birth weight (less than 2500g) and preterm babies be- examination readings. The participants in both studies tween groups. Of the participants in the nicotine patch smoked between 10 to 50 cigarettes per day during their group, 26% had stopped smoking throughout the preg- pregnancy. A more recent study also enrolled 21 preg- nancy and 14% remained smoked free at one-year post- nant women smoking more than 15 cigarettes per day partum. Both these results were not significant to the [23]. Participants were given 22-mg nicotine patches control group. (24 hours/day) and monitored for four days in-hospital Another controlled study has also looked at the followed by an eight-week period outside the hospital efficacy of nicotine patch in pregnant women [25]. Ka- setting. In all patients, non-stress tests were reactive or pur et al recruited pregnant women in their second tri- became reassuring with observation. There were also no mester and smoking more than 15 cigarettes per day. significant pre-term deliveries in this study (gestational Participants were randomized to receive either nicotine age ranged between 36.3 to 41.1 weeks). In all three transdermal patch or placebo patch for 12 weeks. The studies, participants were enrolled in the third trimester, active group received 15-mg patches (18 hours/day) for so results are limited to the later part of pregnancy. The eight weeks, followed by 10-mg patches (18 hours/day) forth, and only randomized controlled study investigat- for two weeks, then 5-mg (18 hours/day) for two Pharmacological Treatment for Pregnant Women Who Smoke Cigarettes 167 weeks. Researchers enrolled 30 patients before ending blood pressure, fetal heart rate and umbilical artery re- the study prematurely after one patient experienced sistance [28]. Lower maternal blood nicotine levels severe signs of withdrawal and rapid and forceful were observed in gum use versus smoking, suggesting movements from the fetus. These symptoms subsided that in pregnant women, nicotine gum delivers less after the patient smoked a cigarette. Fetal ultrasound, an nicotine than cigarette smoking. All three studies only obstetrical examination and a nonstress test were nor- enrolled pregnant women in their third trimester and mal. Of the individuals participating in the study, 17 smoking more than 10 cigarettes per day. received nicotine patch, 13 received placebo. Success rates between active and controller rates were not statis- NON-NICOTINE SMOKING CESSATION tically significant, with only three participants complet- THERAPIES AND PREGNANCY ing their assigned therapy in the active group and no participants in the control group. Bupropion Zyban (bupropion) is gaining popularity as an al- Nicotine Gum ternative to administering nicotine for smoking cessa- Several studies have looked at the use of nicotine tion. Originally intended to treat depression, one of the gum in pregnant smokers.
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